Ballpoint pen



FIG. 1 is an end view of a ballpoint pen showing my new design;

FIG. 2 is an end view thereof from the end opposite that shown in FIG. 1;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a further side elevational view thereof with the ballpoint pen rotated 90°;

FIG. 5 is a further side elevational view with the ballpoint pen rotated a further 90°; and,

FIG. 6 is a side elevational view thereof with the ballpoint pen rotated still another 90°. 

The ornamental design for a ballpoint pen, as shown and described. 